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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8639d8db85bf4ce256b13477be1a4efc2b96b855349ad6875b4d2a64afe1cd92' 
  AND token = 'fnMbAR9BhsUStB444/m7fWvp1oGUjy3g8UMzZ8a2n7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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