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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196e72e0ea6f60f1748a831451af2d6d3f4e42dd4a35b885e4abd2855019a486' 
  AND token = 'NX8ZiOwPWxI1iQN6IQlTOMXHFPEYgmPaumUoMlDPeD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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