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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a256e31a24c9ce8ce219cf2cd5a7207f5aa7b8a7941dd4c58ede1c981a77bd' 
  AND token = 'wYvHoee3mKATEvJ1ytl7/5XDiMNtY6jVqqOMk/m8FXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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