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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230339b15096ece7920c7f8ddc7b09434e670785a060df6a1b8c0bebbd551a3a' 
  AND token = 'pj90aDpQDx8iymWy1MgUPqCL6tWb2DepMMCalBhOvns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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