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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae19c9a98ae89cc947497cde8f5c4402f458e3e4ffb6844db4df3640e5f8289a' 
  AND token = 'jg7KeXpZXiyqhQ/SQ/EOF0XqKaoMfnns8RUMZ6Wc62w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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