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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc73263d78c85f4a2463b3f582f33075c9c4b3f2767a5f5217a3f586796d78bf' 
  AND token = 'Dk2oG9FokCn/abQCDO9sDD4K2VsuhmX3dVn+G5YhziA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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