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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9133595bc6e91433ed73f7e3e770319d5c193e049f086cd71e8c2a8206352e0c' 
  AND token = 'P0jeL3tyzRbQVSoGXeJtuCvxEQpdQZp7zE7ynNT0rBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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