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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0aa0b23976e0d02c41ea15a89fb151efce0007a31b1befe12afbf9c62bb0616' 
  AND token = '3m9XwKP7ff0oQ//ek6RIPp93xJAwrCDfOAwRLBl3ha0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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