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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a989c591f61a0763f6304846413319b1fd96de82fcf686f1421f8ba15b9c4e2' 
  AND token = 'fGBS5dKPoJkY0Wnu5J2VthGXsB7q6WaRM2YkrHSPw2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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