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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '618a7f9ed880e34df802e7f8c4fd0aa2bb73e1e9cafaab5bfa27627cbad8fd4f' 
  AND token = 'tqtXHsigKtkIPtid1EtmEY5rF84bCiH2yi/2p1KBpeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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