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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3af9c609eda51ae455b904091dc1d4e5cc0df93ba668a0916a6747c6f45a6f0' 
  AND token = 'UMRa7hOQrBdWLPkOOoVIWUwHCHQsOy6p/alEMelznkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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