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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57b57ca02d19e2b190fbc5eb216224cbd90589454404d49c559e4a048454788' 
  AND token = '3p25mw8NzSXU9MTy7K3l+jJL8kyFbfAihXja/m7QJr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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