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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2104fa4344f5f40ed4c44076f20eb8ef955689a7a2b7f44b9a027e92e49f7c20' 
  AND token = 'tgqimaTnFfY+81EkgtOr/ccpNoPMDj6v6EEUqGnsobc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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