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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4254367e63fadaab58c5832888dad91ed96d46b8366cff22f621fd55000909' 
  AND token = 'rax7HmB2tR6cDH4mecy2SriGvBJThoMa+G4LU8bxus4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}