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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef003f2c7fcc377388bc101f8747e90180f43c174e044ebe2054a2d2b494025' 
  AND token = 'Z6lqq4kFF2RBclqLbmKDKykJKB1e2O6yQ6gxW2PZxUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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