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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9878c9187e10789f36aebdf520348ded702a11236e87fd04e6937eeea39cf4ff' 
  AND token = '/3IX2M50Io447vFGA/gCA2+2c41Q0JkuuWJuqJEEXnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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