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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a201a6469349529dfbee3894e5b8d7f76987be99bb26d487c9f66d112b6107' 
  AND token = 'Qz502NVa6OVOegaTGhb6HPgvpA74+6/q84hbSjf9TuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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