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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139ae64e6a6ebf46aebda4919abc7275b858ed53d51936e96a8dc07913c2e7bf' 
  AND token = 'UbK8Q10v4NB6RwaDz+fII8mABmg16h9SVSM2QIbVgeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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