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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a4c920e28fc861fa1333b2cb174d373461b7d22def5acabdd96560ae8cabd7' 
  AND token = 'nqWJsgylEUFt0973U/3l/r3b1dBi4g7xTYf3RyABZOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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