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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea6a6169783903e9bea7da63c80a0659b11bf3150236ef17bbf9dd68668ce9a' 
  AND token = '1sHtuKqdbgGt/b6Ca/y435aCd6oiOFkeq75A4fi4rxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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