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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4cf68593e358cb13dca3911723d5e8f90c722e864fced12ea7b0cce3115fccb' 
  AND token = '/XPlnDrOkyb9GfvT66bTxfFy+ZljYwXzLqab3gyG2bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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