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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8c806b2c2f932e9e8d490200757cd0b7ccbc164bf5eb7cbf981d30de060c32' 
  AND token = '5tzlXCB2lqW1RPu91gRMJLw0Tp5YKydYF22vcUgSgyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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