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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9128ab8ccaa7976ffa2add3c0600a6130a4e767c46d88cf0589f76c7b6b12822' 
  AND token = '7g2UjEngDoa1zpcHZQaZkdaiYAfC7iALV1FjOEec41Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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