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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41643b17c9ad0e3de256893fa3a694a19018d78f3d13a29867f765bf175bc0da' 
  AND token = 'L6T1/3NyQBaQUufhayvOzRQ8yKB9KjZDm4NAkUhK7JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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