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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231c0f898d3806896a2dca31536b0e75e29bde212f13238549054b13a634a866' 
  AND token = 'ipRem0DUE9vHVIfi/nHnbjdnQFveFbSxAMmwxcRjINU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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