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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4230bd7767ca4f2b6a81a1c0af45ad30203ed707f0d2438948d4b4c7a702f031' 
  AND token = '90Gy3t9dUztN/YhbxEinRujRjqiidibRaO14jw+W5LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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