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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3030fb6f00fd04ae0f2acf0322cb16453e376465e973233f6eaeed17ec863036' 
  AND token = 'R3h+Ali8/UVwwHy07B2vesy1M39zZni926rWaNGmOOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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