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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc5cb207862141e267beaf6dc9a30bf518fb0889d1615588ead8cda78da4c3a' 
  AND token = 'oi+jwq+W5+QuUh6M6AF7tLTG0Y7aILpsPk8TK0Pqq5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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