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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79685f30ed1dd361c8851a54f4cc17aa9cc0f4646b145ed35a0dd05ee311d181' 
  AND token = '7yuGBy3+GuYGHVYCGNrIRu0baoywEYrrh0Q+l6rr47Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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