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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e502b88a4ea5c30a5c30fe6fe033d4f4462091c0d0e4f7071f8dc33faf45a10' 
  AND token = 'TjVMSqfNmfjw9nwae1URuE9tZo9xxrkH/HKaGrB3IMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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