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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c237c36a54f075b40f6832348b2c8b2715d6c6bd8f153dd609b26f18238a5c' 
  AND token = 'A4AC0soQoYVrICkYeOYEaPTemsaBBtPQqfo5a25Nxe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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