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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df7da358ae9bb31b9db629a752909acfbdf8cc4687cdfa8248c87924ce45159' 
  AND token = 'rozfu+XBb9dqyCtI9I1EwwWCTtkKAxihe5r5O4j4054=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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