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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e726a259a75d98c365797a25ec43f08ec13b9415e5540162127e5a1aae7cf933' 
  AND token = 'h4tZgdjEqG9q6NAz4PT22vpcSEn3dz5Vu+tO3r4dCzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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