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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ca32425a76cc3340ae01df49e5d54d6c9d95b9e3233b3cbd6c866580a8d9c9' 
  AND token = 'Q1Hsg5RKK9zEKvOTls0tDORYNZ0F5vn/wb2bI6pV6BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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