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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6286b1fb8cf70a8ca9c5dab9434d479d5ef5639ca0bdbb0d104140cfb5c24202' 
  AND token = 'cfIjdOP5tcYeXJQwbx6AvNgZNYlWUFqZ08+qskTGx3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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