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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b54b03a76b15296458f2b5e259bf3f06c971799d62a61b02fe68e9adb745a6c' 
  AND token = 'klk9q9lpFfVtH0idHfHrMLjkjiZgbqxwdkX8UfrPK9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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