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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba2afdbcd3976b5f6270d1648bd6c4275bdc5aa5106e1f7c447582de499f4c5' 
  AND token = 'PzgHh2mHjEWZsYCRhW/Ioz+MWz2Ms8397Omb13udtKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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