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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1433bfbd200442b7c1b2dffe4f08a8d28ee184bce97a0574176e34827b5e0695' 
  AND token = 'ZP2v9+EVVdsC78l6XI2PlIdLich/+4ds1BF547z8iqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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