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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5bd7615176015ebbbbb78c81c81a1d76f58587196ac9aeef86da19ae97b23e' 
  AND token = 'lOwRU/oz8Y3NriGT41AxJVwE1Wx3NR/3Mmku7fDvMiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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