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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c21b7493336b46a43af4a48ce380aae0e15fce1d3cae6e81e2ccf9c1d94ee0e5' 
  AND token = 'z67C4mkfQTwJT7g0M0hyitJiG/JQPP3rWGf1av4l/F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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