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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e12c8ff53975c2208353a304568e3b6e97967ab15374c167c7b5b3594d70800' 
  AND token = 'tD81rRFrw+8/1G+jVM8c5deaHKNxK8usZNZYMe6S56I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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