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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad822e07da58410f9570fbf40300cf9085c28e5b50dc6c0c3ceee87584a25f45' 
  AND token = 'fZS6zw6HEWiVblkSK9pvf4vW52y1skuUvMJJjJ4Onoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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