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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e79a968a358d3135e83214611c7c0c0700067a46749c0d4340f8ea9be9a44d' 
  AND token = 'jM1FY07kO3GnpSWmuVSL9Ntv7hAsJeR46GuY6lQIdgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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