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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87ab9c8b7f4776508608470aff9747b8d0535de2c3908ab8f7487cfba86e623' 
  AND token = '4vskII/Lws4KZZjLAwLij2K/pl1lxkm94AEMRsqfNRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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