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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b3ea0c0943735973f807b065fe382e1618d140f96bf505a0ec51ae23fe4fd28' 
  AND token = 'M1mXzWJyap0OvKXDmMsO8KYFcqvO2RSUerC/n8J/t8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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