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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e4e4b96b9c8f41119788c550e456fc974ad2b1ce27864146063de009530a8e' 
  AND token = '+ZBCNGpifN5jlcMnk76LC8HgFj6r0a7UWs+dtjX+4l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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