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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dcca094abd2b0464d4631ccc8fc0fc3a0b30b4d15e97946e511f4b9b1edd149' 
  AND token = 'DdNrruIiiFH4OxAvWfCRj5iyPwzfvAxSVjByW+Z5xME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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