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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87a3a2cbededefc219b0a4ba29e436c6e25d58f56284d6705d45620b2f68486' 
  AND token = 'QUykhR19rw6bqZX9Iy1+SkEeOSXMdM6Qq7u/WibinRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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