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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7158f3e59e7090ef1b0b053c61d269bf0f13c65578cda38a7a14166d0de487c0' 
  AND token = 'opOFyerU++Ry3mD5oN7f/r7GOCMfBpiIIEhc2m08Qmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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