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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c171635be5e0ed4a4cde024bc7e867fc3095eb56c1ede4cb00350da75d6f56' 
  AND token = '6DyrSFMH/Ek8vYxPrJnMh8/PdwYSnBLFEicFu+K5t/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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