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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8555c57616dce76d9d3658bebdfd87869a4833be3f818dd39961329a2770c778' 
  AND token = '7wHWqztKC7P95v9eb/WafKRXVBrMeEgOzkxAwYqMHrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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