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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873a27d104edde40b337ae4319cdad6d159a2315582a38fee9b53c6c39090e5d' 
  AND token = '/KHXK6IsLVnzHLANkhhkQZfduNxQNN0V4tT6+xpEioQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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