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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c36b4275f0090d75f4f8fc6e4a1078eb4e798d7ec3003b770ea48c0a9bd0461' 
  AND token = 'QpjdLyb3WTuUhmI31ApmDb06R9nDZWNU/maXpo4nkss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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