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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e906ab741ddd7bdfaa556a5faa8be8818d877ee8e8a0b602d3d93cc3573865ef' 
  AND token = 'APR6TYnegu5jLBwOAx2QwHQYRsks1W2o6y743SB3mnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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