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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a69a0bfb7a80e581370761c0c9803adb6584682936f6daad3b9507333fec53' 
  AND token = 'aL56xQ1KpNMMaHa9lQ+TQiqchawTkx6gZD8A4hNO10I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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