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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3724052bfe0ecffcf046c6487330ecd2c429420d2916adb722cc80da74f552' 
  AND token = '3ia3+pzX+d+J34vZm9EevAXW6tFlk8QX8wJii8DvEc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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