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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c0c8907fd5dd6cbf2fae4afb6673e4777fcfd8b502427fe9e8df7f5764c903' 
  AND token = '5EXJVd0qITqIcARYErhX0wUMcIXQUhiFwQ3UuMa87hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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