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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad9e05e8489d620e60bba8569c5acbebb4aa357b54c1bf0423ee3346e9c93d1' 
  AND token = 'ayxNVsT6VVK10cS61W2uetDL5XMJt3cYIN/YGftKz64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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